Generating interactive emails and tracking user interactions

A system comprising:

• a processing device;
• and
• a memory coupled to the processing device and storing instructions that, when executed by the processing device, cause the system to perform operations comprising:
• receiving an email within an email client, the email comprising a style sheet including a plurality of identifiers that each define a content presentation parameter;
• rendering the email within the email client, wherein the rendering simultaneously causes a first presentation of a first selectable element, and a second selectable element within the email client, wherein the first selectable element is associated with a first identifier of the plurality of identifiers;
• receiving, within the email client, an interaction with the first selectable element;
• and
• in response to the interaction with the first selectable element, causing, within the email client, a second modified presentation of the second selectable element based on the associated first identifier.

A method comprising:

• receiving an email within an email client, the email comprising a style sheet including a plurality of identifiers that each define a content presentation parameter;
• rendering the email within the email client, wherein rendering simultaneously causes a first presentation of a first set of selectable elements and a first content item within the email client, wherein the first set of selectable elements is associated with a first identifier of the plurality of identifiers;
• receiving, within the email client, a selection of at least one element of the first set of selectable elements;
• and
• in response to the selection of the at least one element of the first set of selectable elements, rendering a simultaneous a second presentation of a second set of selectable elements and a second content item within the email client based on the associated first identifier.